null
US
Entrar
Registre-se gratuitamente
Registre-se
Detectamos que o JavaScript não está habilitado no teu navegador. Habilite o Javascript para o funcionamento correto do nosso site. Por favor, leia os
Termos e Condições
para mais informações.
Próximo
Copiar e Editar
Você deve estar logado para concluir esta ação!
Inscreva-se gratuitamente
952080
Evolution (Neutral Theory)
Descrição
Mapa Mental sobre Evolution (Neutral Theory), criado por heartsandkisses em 30-05-2014.
Mapa Mental por
heartsandkisses
, atualizado more than 1 year ago
Mais
Menos
Criado por
heartsandkisses
quase 10 anos atrás
67
0
0
Resumo de Recurso
Evolution (Neutral Theory)
FOCUS: Molecular level/ e.g. N substitutions in DNA and AA substitutions in Proteins
3 CONCEPTS
1. Much evolutionary does NOT confer SELECTIVE ADVANTAGE ~> Not influenced by NATURAL SELECTION
Does not affect ability to SURVIVE & produce VIABLE OFFSPRING
SELECTIVE NEUTRAL
a) Genetic Code is DEGENERATE
b) SILENT MUTATION
Even when mutation took place, functions is the same. Variation is neutral: non-adaptive. Not subjected to Natural Selection
2. RATE of mutation is CONSTANT
Mutations in any DNA Sequence accumulate at absolute time of evolutionary change. As long original function retained
MOLECULAR CLOCK
Standard for measuring the absolute time of evolutionary change at molecular level
Assumption: DNA seq mutates at constant rates.
1. Estimate how long 2 related organisms diverged from same ancestor/ Difference would be proportional to time
FLAWS: 1) Does not run as smoothly 2) Some DNA change more favoured 3) E stimates older than fossil record: high uncertainty
3. Most evolutionary change in populations is the result of Genetic Drift
a) Variation: new alleles, not subjected to natural selection
b) New neutral alleles may be lost/ become fixed
c) Due to Genetic Drift
New allele is added to the population/ neutral genetic changes tend to accumulate and genomes tend to evolve
GENETIC DRIFT
Change in ALLELE FREQUENCY, in small isolated POPULATION due to PURELY CHANCE events
Allele can be eliminated, beneficial or not
DECREASES VARIATION
Esp. small isolated popns
a) Bottleneck Effect
Sudden change in environment ~> drastically reduce popn size
Gene pool: drastic reduction
b) Founders Effect
Few individuals get isolated ~> Colonise a new location
Quer criar seus próprios
Mapas Mentais
gratuitos
com a GoConqr?
Saiba mais
.
Semelhante
Alemão Básico
MarisaS
TROVADORISMO
Denise Teófilo
Direito Constitucional - Concurso Receita Federal - Auditor Fiscal
Alessandra S.
Biomas
vanessamiyato
Seguridade Social e o PAS
Clara Fonseca
10 Passos para elaboração de TCC
IaraNeres
Sistema Endócrino
Gabriel Paes
TCC - ELABORAÇÃO DE PARÁGRAFOS
dtybel
QUIZ DE CIÊNCIAS - FÍSICA
Clean Maria Reis
Direito Eleitoral - Cartões para Memorização
Silvio R. Urbano da Silva
Uso da vírgula
Kekê Dantas
Explore a Biblioteca